-LRB- CNN -RRB- -- Folashade Abugan is the third Nigerian athlete to have failed a drugs test at the Commonwealth Games in India , where she won two silver medals , it was revealed on Friday .

Abugan , who came second in the women 's 400 meters last week and the 4x400m relay on Tuesday , has been stripped of both of her medals after testing positive for the banned anabolic substance testosterone prohormone .

The 20-year-old , who was world junior champion in 2008 , has waived her right to have her `` B '' sample tested , the Commonwealth Games Federation said a day after the four-yearly event finished in New Delhi .

`` Folashade Abugan returned an adverse analytical finding from a test conducted on October 8 , 2010 , after competing in the women 's 400 meter final , '' the CGF said in a statement .

The news comes as a blow to the Nigeria team , who were already reeling following the failed tests of both women 's 100m champion Osayemi Oludamola and Samuel Okon , who came sixth in the men 's 110m hurdles .

That duo tested positive for the banned stimulant methylhexanamine .

The CGF statement also said Abugan has admitted liability for the failed test , and she has been disqualified from all the events she participated in .

`` Ms Abugan wrote to the CGF waiving her rights to have her `` B '' sample analyzed and a hearing , as provided for within the CGF Anti-Doping Standard -LRB- ADS -RRB- . She also admitted liability .

`` She has been disqualified from all events she participated in during the Games , with the results nullified . This includes her silver medal in the women 's 400 meters .

`` As she was also a member of her country 's second placed 4x400m relay team , that result is also nullified . ''

The silver medal she obtained in the 400m will now go to Aliann Tabitha Pompey of Guyana , with Christine Amertil of the Bahamas being promoted into the bronze medal position .

England 's quartet of Kelly Massey , Victoria Barr , Meghan Beesley and Nadine Okyere have been elevated to second position in the 4x400m relay , with Canada 's Amonn Nelson , Adrienne Power , Vicki Tolton and Carline Muir now claiming bronze .

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Nigeria 's Folashade Abugan has tested positive for a banned substance

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She has been stripped of the silver medals she won in the 400m and 4x400m relay

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She is the third Nigerian to fail a drugs test at the Commonwealth Games